Pneumatic jack.



L. J. DITTMAR.

PNEUMATIC JACK.

APPLICATION FILED JAN. 0, 1911.

1 04 301 Patented Dec. 24, 1912.

Al/orney ".CYUU'HCY, IBSSIGNOR TO PNEUMATIC JACK 1", A GGRPOEMXTION D13 KLENTUCIIKC Pa vuntixifi E3643. 2%,, 19.?12.

EL'ILiP-I N0. $91,195.

25 with the cylinder 15 befsiuii 2:2. The member ".20 emulsified wiiii any suitable iinlii Pliisslilc ms imiicziied Mum-5 iii :36, while the upper: face is g n'uviiiud with irnnluct iugs 2? .i the ubjcirt to lie lii'tmi,

Fig i and Thu 1115mm, ill and :42 are Lhru-Luiud npnn mil 3U snow m; it. umi J9 LCSWCC- and tin; (mun: periphery 01. these pis- U/ikitti wii h :1 pzutkmg 3U hhttillid iiiiwiiis ul Iii. MM. :11 whiuii CXUHlLiri uiuiiipiiig ring 132 and LL imldii'ig u: hiiiui' i-i-iiig zuinpbuil m embrace 1; i'iwinbm' :H. Tiins iiriiiiing; ring Qua: uzzcwwry icusimn upon the vere 01*. packing 230 to secure iiJliii wiih 111v Waiis oi? the uylin; um: and jfljltjiiil'lg rings in the mu. 1;} are similar in G031 1 m lllkii each iii ihesu c viimiers is pro- Wiiil an induiuzii'. opening 3 ZlLijtUIOUL- "on iziieruoi. Each of the .13 511w, be secuz'ud against we! 01 ml wummi. by means uf 2L cuttui' pin 35 device as shown in l.

, Uri/inn pci'niits Um iuimduutin. iiiiir i IH'L.:-H1. ihmugh the i'ifiing n. pij'iflil rod and provider; fur iih .Lh'iim! mriiuuiii much of in} vision; cmby miii luiji, and 11530 Uw pistionss are fimiwii will; making zneuns io confine: m1; \miis; 01'. the cylimiem,while the vshim is sufizuiy puckmiuttlio point i. Mu Lin: iow cyiimim it Stuii that; in this constructkm with ,yiiiu'lm's may bu Silplkiifid with in iiilifil llgii ti 5: liftin :Jimii' and z nuier mi 5 of the pistuns 11 ruvm fij-v r;

i we of the pressure. minimum-i2, 1m Ilium m is provliieii "11 communiiatiiig with f i'w uyi- "iii'i. much ufiho pisimis mouiiiuil (1130M :-.-:.iiii Mum while tin: gvwwgguifor the sh m Hwm tin.- iu\vw:0y1i1 provided ",viiii ii y.- tu pursuit, escape of The, outlet open.-

cyliuiicrs limits the i l'linfti (7f their pistons and relieves t? :iinm: said. pisions,

law

through the reciprocating stem or lifting member. 4

Having described my invention and set forth its merits, what I claim and desire to secure by Letters Patent is- 1. A pneumatic jack comprising a lower cylinder having a centrally apertured cap, an upper cylinder arranged on said cap provided with an apertured base and an apertured cap, a hollow lifting member slidably mounted in said apertures having stepped reduced threaded portions, apertured pistons mounted on said threaded portions OI" said member, said member having openings communicating with the respective cylinders beneath the pistons, and an inlet port adjacent its upper end.

2. A pneumatic jack comprising a pair of cylinders, each having a double bottom and threaded portions abutting against said shoulders, fastening members extending through sald lift-mg member below said plstons, said lifting member being provided ,1;

with an open lower end and a closed upper end, having a lateral inlet adjacent the closed end thereof, and provided with openings communicating with the respective cylinders beneath the pistons, and'means for securing said cylinders in superposed posi tion.

In testimony whereof I affix my signature in presence of two witnesses.

LOUIS JJDITTMAR.

Witnesses:

L'uornnn SKILLMAN M. A. Wnnnnn. 

